Palaeozoology, also spelled as Paleozoology, Vertebrate paleozoology alludes to the utilization of morphological, worldly, and stratigraphic information to outline history in developmental hypothesis. Vertebrates are delegated a subphylum of Chordata, a phylum used to group species holding fast to a pole molded, adaptable body compose called a notochord. They contrast from other phyla in that other phyla may have ligament or ligament like tissues framing a kind of skeleton, however just vertebrates have what we characterize as bone. Classes of vertebrates recorded in sequential request from most established to latest incorporate heterostracans, osteostracans, coelolepid agnathans, acanthodians, osteichthyan angles, chondrichthyan angles, creatures of land and water, reptiles, warm blooded creatures, and winged animals. All vertebrates are contemplated under standard transformative speculations of conduct and life process, in spite of the fact that there is discussion about whether populace can be precisely assessed from restricted fossil assets. Transformative inceptions of vertebrates and in addition the phylum Chordata have not been experimentally decided. Numerous trust vertebrates separated from a typical predecessor of chordates and echinoderms. This conviction is very much bolstered by the ancient marine animal Amphioxus. Amphioxus does not have bone, making it an invertebrate, but rather it has normal highlights with vertebrates including a sectioned body and a notochord. This could suggest that Amphioxus is a transitional frame between an early chordate, echinoderm or regular predecessor, and vertebrates.